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问题:
I have electric-pair-mode on (which isn't really particularly relevant, as this could apply to any auto-pairing mode or even manual parens), but in a nutshell, I'd like it so that in the case I have:
function foo() {|}
(where | is the mark)
If I press enter, I would like to have it automatically go to
function foo() { | }
It would also mean that
function foo(|) {}
would become
function foo( | ){}
I already have things to take care of the indentation, but I'm not sure how to say "if I'm inside any empty pair of matched parenthesis, when I press return, actually insert two new lines and put me at the first one".
Thanks!
回答1:
Here is what I have in my init file, I got this from Magnar Sveen's .emacs.d
(defun new-line-dwim () (interactive) (let ((break-open-pair (or (and (looking-back "{") (looking-at "}")) (and (looking-back ">") (looking-at "<")) (and (looking-back "(") (looking-at ")")) (and (looking-back "\\[") (looking-at "\\]"))))) (newline) (when break-open-pair (save-excursion (newline) (indent-for-tab-command))) (indent-for-tab-command)))
You can bind it to a key of your choice. I have bound it to M-RET but if you want, you can bind it to RET. The lines
(or (and (looking-back "{") (looking-at "}")) (and (looking-back ">") (looking-at "<")) (and (looking-back "(") (looking-at ")")) (and (looking-back "\\[") (looking-at "\\]")))
check if cursor is at {|}, [|], (|) or >|< (html).
回答2:
You may also want to look into smartparens. Specifically, see the page on insertion hooks.
Here's the config I personally use:
(with-eval-after-load 'smartparens (sp-with-modes '(c++-mode objc-mode c-mode) (sp-local-pair "{" nil :post-handlers '(:add ("||\n[i]" "RET")))))
This has the added benefit of indenting the current line automatically as well. This can easily be generalized to more modes (using sp-pair for global pairs) and paren types (just duplicate the code), if you please.
